Here is the full list of all 56 Grim Clicker achievements.
Complete 100 quests
Kill 20 bosses
Kill 500 champions
Perform 50 rituals
Upgrade weapon to quality 15
Upgrade weapon to quality 10
Reach Zone 50
Kill 10000 fireflies
Kill 10 bosses
Click 50000 times
Remove three locks
Open 30 chests
Upgrade weapon to quality 5
Upgrade any item
Complete 50 quests
Open 20 chests
Get 20 wisdom
Get 20 strenght
Get 20 dexterity
Kill 5 bosses
Open 3 boss chests
Find people on the shard
Get 15 wisdom
Get 15 dexterity
Get 15 strenght
Open shard chest
Perform 20 rituals
Upgrade any weapon
Dissasemble any item
Get 10 wisdom
Get 10 dixterity
Open 10 chests
Get 10 strenght
Perform 10 rituals
Get level 20
Kill 1000 fireflies
Get 5 wisdom
Remove one lock
Get 5 dixterity
Get 5 strenght
Complete 10 quests
Kill 25 champions
Collect 500 candles
Get level 10
Collect 250 candles
Collect 100 Candles
Click 5000 times
Reach Zone 10
Collect 50 Candles
Open 1 chest
Kill 20 fireflies
Perform 1 ritual
Get level 5
Reach Zone 5
Click 500 times
Kill 1 champion